Barry Manilow, Reba McEntire and More Send Well Wishes to Neil Diamond After Parkinson's Diagnosis

From Brian Wilson to Barry Manilow, famous fans are flocking to social media to send messages of hope and healing to Neil Diamond following his shocking Parkinson's diagnosis.

On Monday, the legendary singer -- who will turn 77 on Wednesday -- announced his retirement from touring based on his doctor's advice.

“It is with great reluctance and disappointment that I announce my retirement from concert touring," he said in an official statement on his website. "I have been so honored to bring my shows to the public for the past 50 years."

Almost immediately after the announcement, celebrities across the globe began sharing kind words online. Brian Wilson of the Beach Boys, along with his daughter, Carnie Wilson, posted well wishes to Twitter and thanked the "Sweet Caroline" singer for his "years of touring and timeless beautiful music."

I just wanted to say to you @NeilDiamond Thank you for these years of touring and your timeless beautiful music that has brought happiness to the world. Take care and know that we all love you so much! Your heart light shines wherever u go!! ❤️

On Tuesday afternoon, Diamond himself took to Twitter to thank his friends and fans for the "outpouring of love and support," while his wife shared her gratitude for those who are donating their concert ticket refunds to Parkinson's research.

This makes me smile. Thank you. Thank you to everyone for your outpouring of love and support. It makes a difference. https://t.co/TLZAa69q1B

I am dismayed at the news that one of the greatest songwriter/performers of my generation #NeilDiamond has to curtail his activities due to illness.Thru his music,Neil brought untold joy to countless fans and to the world.I wish you all the best, Neil, and remain a "Believer"~ pic.twitter.com/wz1CDEaTWJ